CLOSE_WAIT issues

List,

We have had similar problems in the past, but this seems to be  
happening more often now:

Web site performance becomes erratic (some instances not responding)
Viewing JavaMonitor one or two instances show 0 in the Transactions  
column, even though you know that is not the case (there will have  
been hundreds or thousands)

Our WO app instances are all within the port range of 2000 - 2050:

Running:
/usr/sbin/lsof -i tcp:2001-2050 -P
gives some ok LISTEN lines + some problem lines like this:

java     553 root   20u  IPv6 0x04bbcd68      0t0  TCP plug:2025- 
 >plug:64477 (CLOSE_WAIT)
java     553 root   21u  IPv6 0x0646b2c8      0t0  TCP plug:2025- 
 >plug:64483 (CLOSE_WAIT)

When I send a kill -9 to the problem process, 533 these are of course  
cleared.

Casting my lsof net a bit wider:
/usr/sbin/lsof -i tcp:2001-2050 -P
gives about 10 lines like this:

java     281  root    9u  IPv6 0x04bba470      0t0  TCP [::127.0.0.1]: 
49228->[::127.0.0.1]:3306 (CLOSE_WAIT)
java     569  root    9u  IPv6 0x0616dd70      0t0  TCP [::127.0.0.1]: 
49247->[::127.0.0.1]:3306 (CLOSE_WAIT)

These all seem to be wotaskd processes. Are there meant to be 10  
wotaskd processes running?

I tried sending a kill -QUIT signal to one of my hung WO instances to  
force a stack trace, but nothing came out in the log file. I have now  
read the posting about editing SpawnOfWotaskd.sh to get the log  
output, so will do this for next time.

As an aside, we try to use lsof every night in a script to detect  
these problems and reboot, but lsof sometimes returns absolutely  
nothing or "unable to read process table" or something close to that.  
I have read this is a bug with 10.4.6. Not sure if 10.4.7 helps.  
Perhaps related to also having > 2G of RAM.

These CLOSE_WAIT problems seem to appear with a release of WO (I  
forget which) and never went away, though I am still using the WO  
version one back from the latest (where WO is not bundled in XCode).

Is the root of this problem likely to be a deadlock in our instances?  
I will report back if I can get some stack trace info next time.

Thanks
John